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Applied tech year 8
Not finished
| Question | Answer |
|---|---|
| Name four types of motion and explain and give an example | Linear- straight line motion e.g a train Rotary- circular direction motion e.g a wheel Oscillating- motion from one side to another e.g a swing Reciprocating- repeated motion along a straight line e.g scroll saw |
| How do you calculate gear ratio | Number of teeth on driver gear/ number of teeth on driven gear |
| What’s a mechanism | A device that changes input motion to a desired output motion |
| What’s a compound gear | A smaller and larger gear on the same shaft. This allows for greater variety for speed |
| What’s a gear train | A gear I between two gears allow for both gears to run in the same direction |
| Chain and sprocket | Two gears meshed on a chain to prevent slipping e.g a bike |
| How do you calculate mechanical advantage | Load/effort |
| Pulley and wheel | A belt tensioned between two pulley wheels that requires no lubricants but can slip easier |
| Fulcrum, load and effort | Fulcrum- a fixed pivot point Effort- the force used to move around the fulcrum Load - the weight being moved |
| Name three types of screw heads | Flat Pozi Phillips |
| Adhesives | Permanent jointing like glues used to join materials |
| Loads | What structures are designed to carry |
| Explain the two types of loads | Dynamic - moving loads that vary in intensity e.g car over a bridge vs a truck Static - loads that don’t move and are constant e.g a roof on a building |
| Strut | A member of a structure under compression |
| Tie | A member of a structure under tension |
| Torsion | A turning force placed on a member e.g screwdriver |
| Shear | A sliding force placed on a member e.g scissors |
| Compression | A pushing/ squeezing force applied on a member e.g vice |
| Tension | A pulling force applied on a member e.g hacksaw blades |
| Triangulation | A method of building structures as triangles naturally are stronger |
| Framed structure | A structure where pieces are joined together like a skeleton to make a strong yet lightweight structure |
| What are three types of bridges | Suspension bridge- bridges that are hung below powerful wires on vertical suspenders Arch bridge - bridges that takes compression under the bridge Cable stayed bridge- like a suspension bridge but all loads are placed on a single tower |
| What’s a double pull double throw relay | It’s a relay that can switch between two states whilst still being turned on |
| What’s a relay | An electronically operated switch that can turn low peer inputs into high power outputs |
| What’s a limit switch | A switch that automatically stops movement to prevent unnecessary movement. Usually used in parking gates. |
| What’s a led | A light emitting diode. Uses very little electricity to light up |
| What’s a speaker | Turns electricity into sound |
| Dc motor vs geared dc motor | Dc motor rotates fast while a geared dc motor rotates with more torque |
| Transistor | Amplifies current in a circuit |
| Diode | Forces currents to flow in one direction |
| Capacitor | Smoothly releases a small electric charge |
Created by:
O15iny